Mapping and metadata information could not be found for EntityType'setting'

hi everybody,
    in the entity date model , i will a table name is "Transfer" after Update Model from database. In solution

i have add class name is "Transfer.cs" with property  
public int TransferId { get; set; }
public int CustomerID { get; set; }
public string NameBanking { get; set; }
public string NumberAccount { get; set; }
public string PersAccount { get; set; }
public int DisplayOrder { get; set; }      

and  class  name is"TransferManager.cs" with method such as:
public static List<Transfer> GetAllTransfer()
        {
            var context = ObjectContextHelper.CurrentObjectContext;
            var query = from c in context.Transfer
                        orderby c.DisplayOrder
                        select c;
            var transfer = query.ToList();

            return transfer;
        }

and in class "NopObjectContext" add new methode of Transfer:
public ObjectSet<Transfer> Transfer
        {
            get
            {
                if ((_transfer == null))
                {
                    _transfer = CreateObjectSet<Transfer>();
                }
                return _transfer;
            }
        }
private ObjectSet<Transfer> _transfer;

in model still have entity type name is "Transfer" and EntityContainer:Noptities  of entity type still have name"Transfer"
after built solution success, but run website then message error at method:
public ObjectSet<Setting> Settings
        {
            get
            {
                if ((_settings == null))
                {
                    _settings = CreateObjectSet<Setting>();
                }
                return _settings;
            }
        }

can you help me error?

Is there any one can help in this ? , i am having a similar problem ???

You can find many possible solutions to the problem on internet, take this one for example.